Note: The Components hierarchy contains terms for the constituent parts of objects, including structures, images, and texts. In those instances where a term refers to an element that may sometimes be a component and sometimes stand alone, it is placed with a preferred parent in the most suitable hierarchy. For example, "chapels (rooms or structures)," which are always rooms or spaces but may sometimes also be independent buildings, appears with a preferred parent in the <Christian religious building spaces> section of the Components hierarchy, and a non-preferred parent as Single Built Works. Relation to other hierarchies: Higher-level nodes for components are placed with a second parent under the record for the visual work, tool, etc. to which they pertain; this relationship is a partitive (whole/part) relationship, whereas all other relationships in the AAT are genus/species. For example "aerophone components" has a second parent as a Partitive Relationship (P) to "aerophones." Terms for features that are not separable as actual components, such as ornamental patterns and physical effects (e.g., "fluting," "wrinkles"), are in the Physical Attributes facet. Terms for items permanently installed into the fabric of the built environment (e.g. "altars") are Components, while movable articles used to furnish indoor or outdoor spaces are in the Furnishings hierarchy.